Magnetic Radial Vortex Core and Coupled Edge-Soliton Pair Gyration Dynamics

Abstract

We studied the gyration dynamics of a magnetic radial vortex core by injecting spin-polarized current into a nanodisk through a nanocontact. The simulation results indicate that the radial vortex core can rotate in an approximately circular orbit with a stable frequency. As the current density increases, the radius and frequency of rotation increase, while the rotation stabilization time decreases. Simultaneously, the intensity of the interfacial Dzyaloshinskii–Moriya interaction has a great influence on the frequency and the maximum drive current density of the gyration. The Oersted field generated by the current can reduce the stabilization time. The radial vortex core transforms into an edge soliton pair and rotates stably along the boundary of the disk for a certain range of current densities. This work provides deeper insight into the gyration dynamics of magnetic radial vortices and the potential for the development of nano-oscillators based on radial vortices.